SL-NKUA Seismic Hazard Earthquake Catalogue Authors Angelos Zymvragakis (National and Kapodistrian University of Athens) — ORCID George Kaviris (National and Kapodistrian University of Athens) — ORCID Ioannis Spingos (National and Kapodistrian University of Athens) — ORCID Description Makropoulos et al. (2012) released their earthquake catalogue of Greece, intended for use in seismic hazard modelling, covering the time period between 1900–2009. Their catalogue was homogenized, in terms of magnitude types, to facilitate proper estimation of hazard-related seismicity parameters (e.g. Gutenberg-Richter parameters). The Seismic Hazard Earthquake Catalogue of SL-NKUA (SHECSL) enhances the original catalogue by extending it to 2023, including strong recent earthquakes such as the 2020 Samos earthquake of Mw=6.7. Event origins and magnitudes were retrieved from ISC Bulletin, and the same homogenization process was applied to the newer events (i.e., convert ISC's mb to Ms and Mw). The ISC mb used in our extending process (post-2009) is included (original magnitudes were not pusblished with the original catalogue). We include all available earthquakes of Mw≥4.1, independent of depth, so that the user may isolate crustal or intermediate depth (or use both) earthquakes, based on their use-cse. SHECSL (with the events until 2009 retrieved from the Makropoulos et al. (2012) catalogue) was built on the following sources: Period Source 1908–1959 Annual bulletins of the Seismological Institute of Uppsala (SIU) for the recordings of the station UPP 1951–1955 Annual bulletins of SIU for the recordings of the station KIR (Kiruna) 1956–1963 Monthly bulletins of SIU for all Swedish Seismological Network 1901–1970 UNDP/UNESCO Survey of the Seismicity of the Balkan Region 1964–2023 ISC (up to 2009 in the original catalogue) Description of Extended (post-2009) data Number of earthquakes added: 1,788 Focal depth range (km): 0 - 184 mb range: 4.2 - 6.4 Ms range: 4.0 - 7.0 MW range: 4.1 - 6.7 Files The catalogue is provided as a CSV file: nkua_sl_seismic_hazard_earthquake_catalogue.csv Field description: source_origin_time: Origin time in ISO 8601 timestamp. source_origin_year: Origin year (integer). source_origin_month: Origin month (integer). source_origin_day: Origin day (integer). source_origin_hour: Origin hour (integer). source_origin_minute: Origin minute (integer). source_origin_second: Origin second (float). source_origin_latitude_deg: Source latitude in decimal degrees (WGS84) (float). source_origin_longitude_deg: Source longitude in decimal degrees (WGS84) (float). source_origin_depth_km: Source focal depth in km (float). source_magnitude_ms: Surface wave magnitude (Ms) (float). source_magnitude_mw: Moment magnitudes (Mw) (float). source_magnitude_mb_isc: Body-wave magnitude (mb) (float). source_doi: Persistent identifier of the original source of the origin and magnitude data (string). Additional files LICENSE: CC BY-NC 4.0 legal code. README.md: The current README file. Keywords Seismology Seismic Hazard Earthquake Catalogue Greece License Attribution-NonCommercial 4.0 International Funding European Commission OSCARS - O.S.C.A.R.S. - Open Science Clusters’ Action for Research and Society Grant agreement ID: 101129751 Version 1.0.0 Publication date (YYYY-MM-DD) 2026-02-05 Size and formats Total size: 879 KB File formats: CSV How to cite Zymvragakis, A., Kaviris, G., Spingos, I. (2026). SL-NKUA Seismic Hazard Earthquake Catalogue. Zenodo. Contact Name: Angelos Zymvragakis Email: azymvragakis@geol.uoa.gr Affiliation: National and Kapodistrian University of Athens